That marvelous moment when two previously sung melodies first fit together is an important milestone for developing groups. And there's nothing like a well-crafted partner song arrangement to take you there. Over the years, George Strid and Mary Donnelly have set the standard for quality partner songs, and this treatment of the well-known Mexican folk tune is no exception. Sing both lines in English or teach Spanish words using the included pronunciation guide. Seriously, if you want to take steps toward harmony, follow the magic formula: A, then B, then together. "¡Ay, ay, ay, ay!"